diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index bc5cf8d46742..55828149e01e 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -88,7 +88,7 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,
 		".previous\n"
 		_ASM_EXTABLE(1b, 3b)
 		: "=r"(faulted), "=a"(replaced)
-		: "r"(ip), "r"(new), "r"(newch),
+		: "r"(ip), "r"(new), "c"(newch),
 		  "0"(faulted), "a"(old)
 		: "memory");
 	sync_core();